Graphenea

A single-layer graphene film on a copper substrate. This product is provided with a PMMA coating on top of the Graphene in order ease the transfer process and to avoid contamination. It's a high quality product, with a great homogeneity, and it is ideal for R&D departments and universities.

Graphene Film

· Growth method: CVD synthesis

· Appearance (color): Transparent

· Transparency: > 97%

· Appearance (form): Film

· Coverage: > 95%

· Number of graphene layers: 1

· Thickness (theoretical): 0.345 nm

· FET Electron Mobility on Al2O3: 2000 cm2/Vs

· Hall Electron Mobility on SiO2/Si: 4000 cm2/V

· Sheet Resistance on SiO2/Si: 450±40 Ohms/sq (1cm x1cm)

· Grain size: Up to 10 μm

Substrate Cu Foil

· Thickness: 18 μm

· Pretreated for easier bottom layer removal: Monolayer graphene on the back side of Copper is partially removed, but not completely, so an additional treatment like RIE is needed before transfer to eliminate the bottom layer totally

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Frequently Asked Questions

A: PMMA is used as a protective layer, and this layer can be removed using organic solvents (acetone and IPA) or with thermal treatment. Our standard process is to remove the PMMA with solvents. As an alternative a thermal treatment can be done. This thermal treatment leaves less amount of residues, but the Raman spectra is modified due to the strain created during the treatment. Although the electrical properties of the graphene remain intact thermal treatment is avoided for not modifying Raman signal.

A: Graphene is transferred via wet process. In order to etch the copper, the graphene is protected with a sacrificial polymethyl methacrylate (PMMA) layer. A ferric chloride solution is used for etching. Once the etching is complete, the graphene is washed and transferred onto the desired substrate. Finally, the PMMA layer is removed using organic solvents.